|Class|Type|Ships|Displacement|Note|
|---|---|---|---|---|
|Rari class|Tug supply vessel|A635 Revi|1,450 tonnes||
|Malabar class|Ocean going tug|A664 Malabar A669 Tenace|1,440 tonnes|Ice-breaking capabilities to 2 meters level ice|
|UT507 class|Salvage Tug|Abeille Flandre Abeille Languedoc|1,500 tonnes|Chartered|
|UT515 class|Salvage Tug|Abeille Bourbon Abeille Liberté|4,000 tonnes|Chartered|
|UT710 class|Support, Assistance, Pollution control vessel|Argonaute Jason|2,100 tonnes|Chartered, configured to accommodate NATO Submarine Rescue System|
|UT711 class|Support, Assistance, Pollution control vessel|Alcyon Ailette|2,000 tonnes|Chartered|
||Training ships|VN Partisan|2,250 tonnes|Chartered|
||Training ships|VN Rebel||Chartered|

Question: how many of the classes are type salvage tug?
Answer: 2